Effect of solvents on the morphology and structure of barium titanate synthesized by a one-step hydrothermal method  

作　　者：Xiaoxiao Pang Tingting Wang Bin Liu Xiayue Fan Xiaorui Liu Jing Shen Cheng Zhong Wenbin Hu 

机构地区：[1]Key Laboratory of Advanced Ceramics and Machining Technology(Ministry of Education),and Tianjin Key Laboratory of Composite and Functional Materials,School of Materials Science and Engineering,Tianjin University,Tianjin 300072,China [2]Chongqing Newcent New Materials Co.,Ltd.,Chongqing 401147,China [3]Joint School of National University of Singapore and Tianjin University,International Campus of Tianjin University,Fuzhou 350207,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2023年第7期1407-1416,共10页矿物冶金与材料学报（英文版）

基　　金：supported by Chongqing Newcent New Materials Co.,Ltd.,China (No.2021GKF-0708).

摘　　要：Tetragonal barium titanate was synthesized from barium hydroxide octahydrate and titanium tetrachloride through a simple one-step hydrothermal method.The effect of different solvents on the crystal structure and morphology of barium titanate nanoparticles during the hy-drothermal process was investigated.Except for ethylene glycol/water solvent,impurity-free barium titanate was synthesized in pure water,methanol/water,ethanol/water,and isopropyl alcohol/water mixed solvents.Compared with other alcohols,ethanol promotes the formation of a tetragonal structure.In addition,characterization studies confirm that particles synthesized in methanol/water,ethanol/water,and isopropyl al-cohol/water mixed solvents are smaller in size than those synthesized in pure water.In the case of alcohol-containing solvents,the particle size decreases in the order of isopropanol,ethanol,and methanol.Among all the media used in this study,ethanol/water is considered the optimum reaction media for barium titanate with high tetragonality(defined as the ratio of two lattice parameters c and a,c/a=1.0088)and small aver-age particle size(82 nm),which indicates its great application potential in multilayer ceramic capacitors.

关 键 词：barium titanate hydrothermal synthesis TETRAGONALITY solvent effects 

分 类 号：TQ132.35[化学工程—无机化工]